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-rw-r--r--include/linux/usb/serial.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h
index 4267a9c717b..10cb74d2ad1 100644
--- a/include/linux/usb/serial.h
+++ b/include/linux/usb/serial.h
@@ -389,5 +389,20 @@ do { \
printk(KERN_DEBUG "%s: " format "\n", __FILE__, ##arg); \
} while (0)
+/*
+ * Macro for reporting errors in write path to avoid inifinite loop
+ * when port is used as a console.
+ */
+#define dev_err_console(usport, fmt, ...) \
+do { \
+ static bool __print_once; \
+ struct usb_serial_port *__port = (usport); \
+ \
+ if (!__port->port.console || !__print_once) { \
+ __print_once = true; \
+ dev_err(&__port->dev, fmt, ##__VA_ARGS__); \
+ } \
+} while (0)
+
#endif /* __LINUX_USB_SERIAL_H */